Moved logger to independent library

CMakeLists.txt

apps/cpu/LaminarTubeFlow/ltf.cpp

src/basics/CMakeLists.txt

src/cpu/VirtualFluids.h

...VirtualFluidsCore/CoProcessors/WriteBlocksCoProcessor.cpp

...sCore/CoProcessors/WriteBoundaryConditionsCoProcessor.cpp

src/logger/CMakeLists.txt

src/logger/Logger.cpp

src/logger/Logger.h